1、BS EN 755-7:2016Aluminium and aluminiumalloys Extruded rod/bar,tube and profilesPart 7: Seamless tubes, tolerances ondimensions and formBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 755-7:2016 BRITISH STANDARDNational forewordThis British Standard is the UK i
2、mplementation of EN 755-7:2016. It supersedes BS EN 755-7:2008 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee NFE/35, Light metals and their alloys.A list of organizations represented on this committee can be obtained on request to its secretary.This
3、publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 91003 6 ICS 77.150.10 Compliance with a British Standard cannot confer i
4、mmunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 755-7:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 755-7 J
5、une 2016 ICS 77.150.10 Supersedes EN 755-7:2008English Version Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 7: Seamless tubes, tolerances on dimensions and form Aluminium et alliages daluminium - Barres, tubes et profils fils - Partie 7 : Tubes fils sur aiguille, tolra
6、nces sur dimensions et forme Aluminium und Aluminiumlegierungen - Stranggepresste Stangen, Rohre und Profile - Teil 7: Nahtlose Rohre, Grenzabmae und Formtoleranzen This European Standard was approved by CEN on 11 April 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
7、which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This
8、 European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN membe
9、rs are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portuga
10、l, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form
11、and by any means reserved worldwide for CEN national Members. Ref. No. EN 755-7:2016 EBS EN 755-7:2016EN 755-7:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 5 3 Alloy groups 5 4 Tolerances on dimensions . 5 4.1 General 5 4.2 Diameter - Round tube 5 4.3 Width, depth
12、or width across flats - squares, rectangles, hexagons, octagons . 6 4.4 Wall thickness variation (eccentricity) . 7 4.5 Length 8 4.6 Squareness of cut ends 9 5 Tolerances on form 9 5.1 General 9 5.2 Straightness . 9 5.3 Convexity-Concavity 10 5.4 Twist . 11 5.5 Angularity . 12 5.6 Corner and fillet
13、radii . 13 5.7 Depth of dents for round tube . 14 Annex A (informative) Wall thickness variation (eccentricity) . 15 A.1 General . 15 A.2 Specifying round tube sizes and tolerances . 15 A.2.1 General . 15 A.2.2 Wall thickness variation for tubes specified as OD t or ID t . 15 A.2.3 Wall thickness va
14、riation for tubes specified as OD ID . 16 Bibliography . 17 BS EN 755-7:2016EN 755-7:2016 (E) 3 European foreword This document (EN 755-7:2016) has been prepared by Technical Committee CEN/TC 132 “Aluminium and aluminium alloys”, the secretariat of which is held by AFNOR. This European Standard shal
15、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2016, and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this do
16、cument may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 755-7:2008. The following technical modifications have been introduced during the revision: Subclause 4.2, Diameter - Round tube. EN
17、 755 comprises the following parts under the general title Aluminium and aluminium alloys Extruded rod/bar, tube and profiles: Part 1: Technical conditions for inspection and delivery; Part 2: Mechanical properties; Part 3: Round bars, tolerances on dimensions and form; Part 4: Square bars, toleranc
18、es on dimensions and form; Part 5: Rectangular bars, tolerances on dimensions and form; Part 6: Hexagonal bars, tolerances on dimensions and form; Part 7: Seamless tubes, tolerances on dimensions and form; Part 8: Porthole tubes, tolerances on dimensions and form; Part 9: Profiles, tolerances on dim
19、ensions and form. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Mace
20、donia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 755-7:2016EN 755-7:2016 (E) 4 1 Scope This European Standard sp
21、ecifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded seamless tubes with an outside diameter (OD) from 8 mm to 450 mm (round tube, see Figure 1) or with a cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube, see
22、Figure 2), supplied in straight lengths. This European Standard only applies to tube produced by the seamless die/mandrel method of extrusion. This standard applies to extruded seamless tube for general engineering applications only. The temper designations used in this part are according to EN 515.
23、 This European Standard does not apply to: extruded tubes produced by porthole/bridge method (EN 755-8), tubes delivered in coils (EN 13957), coiled tubes cut to length (EN 13957). Figure 1 Round tube Figure 2 Circumscribing circle for other than round tube BS EN 755-7:2016EN 755-7:2016 (E) 5 2 Norm
24、ative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
25、 applies. EN 755-1:2016, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 1: Technical conditions for inspection and delivery 3 Alloy groups For the purposes of this European Standard, the alloys are distributed into two groups which correspond to varying degrees of difficulty
26、 when manufacturing the products. The division into group I and group II of the most commonly used general engineering alloys is specified in Table 1. Grouping of other alloys is subject to agreement between supplier and purchaser. Table 1 Alloy groups Group I EN AW-1050A, EN AW-1070A, EN AW-1200, E
27、N AW-1350 EN AW-3102, EN AW-3003, EN AW-3103 EN AW-5005, EN AW-5005A EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A, EN AW-6106, EN AW-6008 EN AW-6014, EN AW-6060, EN AW-6360, EN AW-6063, EN AW-6063A, EN AW-6463 Group II EN AW-2007, EN AW-2011, EN AW-2011A, EN AW-2014, EN AW-2014A, EN AW-2017A, E
28、N AW-2024, EN AW-2030 EN AW-5019, EN AW-5049, EN AW-5051A, EN AW-5251, EN AW-5052, EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-5083, EN AW-5086 EN AW-6110A, EN AW-6012, EN AW-6018, EN AW-6023, EN AW-6351, EN AW-6061, EN AW-6261, EN AW-6262, EN AW-6081, EN AW-6082 EN AW-7003, EN AW-7005, EN AW-7108, E
29、N AW-7108A, EN AW-7020, EN AW-7021, EN AW-7022, EN AW-7049A, EN AW-7075 4 Tolerances on dimensions 4.1 General When outside diameter OD, inside diameter ID, and wall thickness t, (or their equivalent dimensions in other than round tube) are all specified, standard tolerances shall apply to any two o
30、f these dimensions, but not to all three. As a result, the purchaser shall only state two nominal dimensions on any given order. 4.2 Diameter - Round tube Mean diameter is defined as the average of two diameter measurements taken at right angles to each other at any position along the length. BS EN
31、755-7:2016EN 755-7:2016 (E) 6 The maximum allowable deviation of diameter at any point from the specified diameter is the maximum difference measured at any point along the length of the tube ie it is inclusive of any ovality in the cross section. The tolerances on diameter are specified in Table 2.
32、 As detailed in EN 755-1:2016, Clause 4, if the original order does not make clear the nature of the diameter tolerances required, the supplier shall interpret them as inclusive of any ovality (i.e. maximum allowable deviation at any point from the specified diameter in Table 2). However, the diamet
33、er tolerances may be expressed as both mean and inclusive of ovality if this is specifically requested by the purchaser. Table 2 Tolerances on diameter for round tube Dimensions in millimetres Diameter (OD or ID) Tolerance on diameter Maximum allowable deviation of mean diameter from specified diame
34、ter dMaximum allowable deviation of diameter at any point from specified diameter aOver Up to and including Tempers F and H112 Heat treated tube bTempers O, H111 and Tx510 8 18 0,25 c 0,40 c 0,60 c 1,5 c 18 30 0,30 0,50 0,70 1,8 30 50 0,35 0,60 0,90 2,2 50 80 0,40 0,70 1,1 2,6 80 120 0,60 0,90 1,4 3
35、,6 120 200 0,90 1,4 2,0 5,0 200 350 1,4 1,9 3,0 7,6 350 450 1,9 2,8 4,0 10,0 aNot applicable to tubes having a wall thickness less than 2,5 % of the specified outside diameter. The tolerance for tubes with wall thickness less than 2,5 % of the specified outside diameter shall be determined by multip
36、lying the applicable tolerance as follows: wall thickness over 2,0 % up to and including 2,5 % of outside diameter: 1,5 tolerance; wall thickness over 1,5 % up to and including 2,0 % of outside diameter: 2,0 tolerance; wall thickness over 1,0 % up to and including 1,5 % of outside diameter: 3,0 tole
37、rance; wall thickness over 0,5 % up to and including 1,0 % of outside diameter: 4,0 tolerance. bApplies to all alloys in T4, T5, T6, T64, T66 and Tx511 tempers. cThis tolerance applies for outside diameter only, i.e. tube in this size range can only be specified as “Outside Diameter x Wall Thickness
38、”. dNot applicable to Tx510 or Tx511 tempers. 4.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons The tolerances on width, depth or width across flats are specified in Table 3. BS EN 755-7:2016EN 755-7:2016 (E) 7 Table 3 Tolerances on width, depth or width across flats D
39、imensions in millimetres Width, depth or width across flats Tolerances on width, depth or width across flats a, bCD 100 100 5 - 30 0,30 0,20 30 60 0,40 0,30 60 100 0,60 0,40 100 150 0,90 0,60 150 200 1,2 0,80 200 350 1,8 1,2 5.4 Twist Twist T shall be measured as shown in Figure 5 by placing the tub
40、e on a flat base plate, the tube resting under its own mass and measuring the maximum distance at any point along the length between the bottom surface of the tube and the base plate surface. Twist tolerances are specified in Table 9 as a function of the width W and the length L of the tube. BS EN 7
41、55-7:2016EN 755-7:2016 (E) 12 Key 1 base plate Figure 5 Measurement of twist Table 9 Twist tolerances Dimensions in millimetres Width W Twist tolerance T per 1 000 mm of length aOn total tube length L Over Up to and including up to and including 6 000 over 6 000 10 30 1,2 2,5 3,0 30 50 1,5 3,0 4,0 5
42、0 100 2,0 3,5 5,0 100 200 2,5 5,0 7,0 200 350 2,5 6,0 8,0 aTwist tolerances for lengths less than 1 000 mm shall be subject to agreement between supplier and purchaser. 5.5 Angularity The deviation from square of square and rectangular tubes shall be measured as shown in Figure 6. The maximum allowa
43、ble deviation from square is specified in Table 10 as a function of tube depth B. In case of rectangular tubes, the tolerance on squareness shall apply to the shorter side of the tube. The maximum allowable deviation in an angle other than a right angle (hexagonal tubes, octagonal tubes) shall be in
44、cluded within the width across flats tolerances, see Table 3. BS EN 755-7:2016EN 755-7:2016 (E) 13 Figure 6 Measurement of deviation from square Table 10 Squareness tolerances for square and rectangular tubes Dimensions in millimetres Depth B Maximum allowable deviation Z from square Over Up to and
45、including - 30 0,4 30 50 0,7 50 80 1,0 80 120 1,4 120 180 2,0 180 240 2,6 240 350 3,1 5.6 Corner and fillet radii Sharp corners and fillet radii may be slightly rounded unless otherwise indicated on the drawing. The maximum allowable radii are specified in Table 11. When corner or fillet radius is s
46、pecified, the maximum allowable deviation from the nominal value is specified in Table 12. Table 11 Maximum allowable corner and fillet radii Dimensions in millimetres Wall thickness Maximum allowable corner and fillet radii Alloy group I Alloy group II a 5 0,6 0,8 5 1,0 1,5 aThese tolerances only a
47、pply to 6xxx series alloys in group II. The maximum allowable radii for the other alloys in group II shall be subject to agreement between supplier and purchaser. BS EN 755-7:2016EN 755-7:2016 (E) 14 Table 12 Maximum allowable deviation from specified corner and fillet radii Specified radius mm Maxi
48、mum allowable deviation from nominal value of the radius 5 0,5 mm 5 10 % 5.7 Depth of dents for round tube It is recognized in certain applications that the depth of surface dents can be an important factor particularly for round tube with large diameter to wall thickness ratios. In such cases, the
49、maximum allowable depth of dents shall be subject to agreement between supplier and purchaser. BS EN 755-7:2016EN 755-7:2016 (E) 15 Annex A (informative) Wall thickness variation (eccentricity) A.1 General Wall thickness variation tolerances for round tube can be the source of a lot of confusion. In particular as to whether quoted values are based on the nominal or mean wall thickness. This present section is included in the standard to provide some guidel
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